Device for sharpening band-saws



(No Model.)

G. W. AMESBURY.

DEVICE FOR SHARPENING BAND SAWS. No. 244,158.

Patented July 12,1881.

WITNESSES.- .4;

UNITED STATES PATENT ()FFIQE.

GEORGE WV. AMESBURY, OF PHILADELPHIA, PENNSYLVANIA.

DEVICE FOR SHARPENlNG BAND-SAWS.

SPECIFICATION forming part of Letters Patent No. 244,158, dated July 12, 1881.

Application filed April .17, 1881. (No model.)

To all whom it may concern:

Be it known that I, GEORGE W. AMESBURY, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Devices for Sharpening Band-Saws and I do hereby declare the following to be afull, clear, and exact description of the invention, reference being had tothe accompanying drawings, which form part of this specification, in which- Figures 1 and 2 are vertical sections of my improved saw-sharpener. Figs. 3 and 4 are elevations. Fig. 5 is a plan. Fig. 6 is a similar detail view, and Fig. 7 is a detail perspective.

The object of my invention is to provide a rotary head for filing saws, principally bandsaws, so constructed that it will finish the back of a tooth after the front has been filed, so as to avoid leavinga burr on the latter, as occurs where the front of the tooth is filed last or after the back, and also to give any desired pressure on the back of the saw-teeth in filing the same.

My invention consists of a rotary head for filing saws, made in sections adapted and designed to operate in different planes, one of said sections being adjustable, whereby the front of a tooth will be filed after the back, the adjustability of the section adapting the head to operate on different sizes of saw-teeth and permitting the pressure to he graduated more or less on the back of the saw-teeth, as hereinafter more fully explained.

Referring to the accompanying drawings, A represents the spindle or vertical shaft which carries the rotary head. Said head is shown at B, and is made in two sections, B and B The section B is made fast on the shaft A by a pin, a. Said section carries a thin file, O, the upper horizontal surface of which is serrated at c to file the face of the saw-teeth, its corner a being also serrated to file the throat. Said section also carries a feeder consisting of a straight incline, D, whose highest point is in the same plane with the teeth of the file O. The section B is formed with a collar, 1), which receives the upper end of the shaft A, an adjusting-screw, E, passing down through said collar into a threaded opening in the end of said shaft. Said screw E is formed with a shoulder or neck, 0, having an annular groove, 6. In this groove is a pin, 6 which passes through the side of the collar b, thereby swiveling said screw in the collar 1), so that when said screw is turned by its thumb-nut e the section B will be adjusted 011 the shaft A in the direction of its axis and relatively to the section B. The section B carries a thick file, F, whose periphery is beveled and serrated, adapting it to file the back of the saw-teeth, the upper horizontalsurface of this file being smooth, so that it has only one working-face.

The operation is as follows: The parts being duly adjusted according to the size of the sawteeth to be filed and to the amount of pressure desired for the back of said teeth, the head is caused to rotate. The lower part of the incline,

coming in contact with the face of a tooth, lifts it into the plane of the file O, the latter then following in contact with such face, filing the same and also the throat. The thick file F follows and files the back of the same tooth. Thus at each revolution of the head one tooth is completely filed, the back of said tooth being finished after the face. If the files were in the same plane, the face of one tooth and the back of another would be filed at each revolution, which operation has the effect of leaving a burr on the point of the saw-tooth in filing down the saw; but where the files are in different planes, as herein set forth, the back bein g finished after the face, the burr thrown out in the act of filing is removed by the file, which sharpens the back after such face has been filed. By adjusting the section B the pressure on the back of the saw-teeth may be varied, as it is obvious that by moving down said section its larger diameter is brought to bear againstthe adjacent back of a saw-tooth, this adjustment of such pressure being independent of the pressure exerted by the corner of file G on the throat of the tooth. This is important, as, owing to the small surface operated on by the throat-file, the latter meets with but slight resistance and would out too deeply under the same pressure as the back-file; hence to overcome the greater resistance opposed to the back-file the pressure on the latter should v i I be increased, and this is effected, as above set forth, by the adjustment of the section which carries said back-file.

In an application previously filed by me, and pending atthe same time as this,I have shown and described sectional files attached to a rotary supporting-head, such files being similar in construction to those described and claimed in this case. I therefore do not, in this application, claim, broadly, said sectional files, nor the same in combination with a rotary supporting-head.

What I claim as my invention is as follows 1. A rotary head for saw-sharpeners having sectional files in different planes, whereby at each revolution of said head the face and back of one and the same tooth are filed, substantially as set forth.

2. A rotary head for saw-sharpeners, made in two sections, one of which is adjustable relatively to the other in the direction of the axis of said head, each of said sect-ions carrying a sectional file, one of said files being designed and adapted to sharpen theface and the other the back of a saw-tooth, substantially as set 25 forth. 3. A rotary head forsaw-sharpeners having two sectional files in difl'erent planes, one of which is adapted to file the face of a saw-tooth and the other the back, and a feeder consisto ing of an incline Whose highest point is in or about the same plane as the face-file, whereby said head is adapted to feed the saw upward and file the teeth of the same, finishing the back of the teeth after the faces and removing 35 the burrs, substantially as set forth.

4. In a saw-sharpener, the combination, with shaft A, of section B, made fast on said shaft, section B having collar 1), and swiveled adjusting-screw E, substantially as shown and 4.0 described.

In testimony that I claim the foregoing I have hereunto set my hand this 26th day of April, 1881.

GEORGE W. AMESBURY.

Witnesses:

JOHN W. STEWARD, S. J. VAN STAVOREN. 

